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More unusual passwords can be discovered or created using the Metroid Password Generator software found in the Fan Apps section.

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ITEMS: ALL
ENERGY TANKS: INFINITE
MISSILES: INFINITE

Yes, this is the infamous, fairly recently-found "NAR" password which apparently gives us a "debug" mode with unlimited ITEMS and energy. Debate rages around the origin of this code; while thousands of unusual codes can be generated at random which actually spell out words and names, this appears to be one code which may have actually been programmed to work from the get-go. The meaning of "NAR" is also up for grabs, although one plausible theory says that it's short for T. Narahiro, the programmer credited for the NES conversion of the game -- since the original Japanese Famicom version had a save-game system rather than a password feature, chances are good that Narahiro is the one who programmed it, and may have put in this debug mode himself. Others claim that NAR could stand for "North American Release." Unless we can talk to one of the original team members, guess we'll never know -- but until then, you can enjoy this password which enables you to blaze through the game from start to finish in about 15 minutes -- all you need to do is go kill Kraid and Ridley and then head to Tourian, and it's hello bikini ending!

ITEMS: ALL
ENERGY TANKS: 6
MISSILES: 255

This could be considered the best password in the game. It gives you everything and starts you at the beginning of Tourian with no time on the clock. All you have to do is go in there and beat Mother Brain. Change the C to an E and the 2 to a 0 to play as Suitless Samus.

ITEMS: Ball, Wave Beam, Screw Attack
ENERGY TANKS: 6
MISSILES: 219

This oddly-worded password starts you at the beginning of the game, Suitless. No chance to get a good ending, either.
NOTE: Use a ZERO in the word B0MB, not an 'O.'

ITEMS: Ball, Bomb, High Jump Boots, Varia, Ice Beam, Screw Attack.
ENERGY TANKS: 4
MISSILES: 176 (starting)

This code puts you in Norfair with the Armorless Samus.

ITEMS: Long Beam.
ENERGY TANKS: 3
MISSILES: 24 (starting)

Mr. Yokoi's secret code drops you in Norfair, armored, with no ball, and not the greatest ending if you finish.

ITEMS: Ball, Long Beam, Bomb, High Jump Boots, Varia, Wave Beam, Screw Attack.
ENERGY TANKS: 5
MISSILES: 205

This code puts you in Norfair with these items and the Armorless Samus.

ITEMS: Ball, Long Beam, Bomb, High Jump Boots, Varia, special Ice Beam, Screw Attack.
ENERGY TANKS: 4
MISSILES: 255

This code puts you in Kraid's Hideout with Armorless Samus.
Your Ice Beam projectile looks (but does not behave) like the Wave Beam!

ITEMS: Ball, Long Beam, Bomb, High Jump Boots, Varia, Wave Beam, Screw Attack.
ENERGY TANKS: 5
MISSILES: 205

Puts you in Norfair with Armorless Samus.

Resets the game to the title screen.

Resets the game to the title screen.

ITEMS: Bomb, Wave Beam, Screw Attack.
ENERGY TANKS 1
MISSILES: ???

In the game that this code throws you into, you start in Hideout II and there is the following strange stuff:

• No, that's not a typo, you have bombs but you have to get the Ball!!
• The Varia does not exist, so you better be good!!
• Kraid is dead
• The Mother Brain is not there when you get there!! Just the message telling you that you must escape...but there is no time limit!!

ITEMS: Nothing!
ENERGY TANKS 1
MISSILES: 48

This has gotta be the most useless code ever!! It starts you in Tourian as the armorless Samus equipped with...nothing!! No Varia, no special ITEMS, not even the round ball. You literally can't do anything, because if you try to enter Tourian you'll get killed by metroids in about half a second, and if you go up the elevator you can't get out because you don't have the ball. Still, it's funny...

ITEMS: Screw Attack, High Jump, Ice Beam.
ENERGY TANKS 3
MISSILES: 40

Puts you in Kraid's Hideout, Armorless. You're basically stuck, however, since you do not have the MaruMari and when you go to find it, it's not there.

Turns the screen black, never to return again!
NOTE: When this code is input on the NESticle emulator, the game does start, but with a glitchy blue pattern covering the screen.